CN1826252A

CN1826252A - Testing method and device of defect or fault in condensation air consuming loop of vehicle electronic condensation air system

Info

Publication number: CN1826252A
Application number: CNA2004800212211A
Authority: CN
Inventors: C·戴特来福; H·戴克梅耶; F-D·利普尔特; J·莱因哈荻特; B·斯特利卡
Original assignee: Wabco GmbH
Current assignee: ZF CV Systems Europe BV
Priority date: 2003-07-28
Filing date: 2004-07-12
Publication date: 2006-08-30
Anticipated expiration: 2024-07-12
Also published as: CN100415585C; DE10357764A1

Abstract

According to the invention, in order to identify a defect or failure of a compressed air load circuit in a compressed air installation for vehicles, the pressure in the compressed air load circuits (26 - 38) is continuously measured and is evaluated in an electronic control unit (84) that temporarily blocks the compressed air load circuits, measures the pressure values during the blocking time and/or determines the pressure gradients, respectively compares the pressure values and/or the determined pressure gradients with a threshold value, determines defective circuits, and definitively blocks circuits identified as being defective when the threshold value is not reached.

Description

The defective in the detection vehicle electronic compressed air system in the pressurized air consumption loop or the method and apparatus of fault

The present invention relates to a kind ofly detect pressurized air in the vehicle electronic compressed air system and consume the defective in the loop or the method and apparatus of fault.

Existing multiloop protective valve can be divided into energy source several and independently consume the loop mutually, even during when the loop et out of order, as pipeline breaking, still can keep minimum pressure in loop in working order.When the foot brake loop hinders and during amount that the amount of air that makes loss can replenish greater than compressor, the pressure in the foot brake loop can descend for some reason, when reaching the shutoff pressure of valve till.Although the pressure in the fault loop is still keeping shutoff pressure continuing decline in loop in working order.When the pressure in the fault loop continue to descend, available compressor put on the air to loop in working order still, up to reach fault loop open pressure the time till.So just set up a dynamical equilibrium, though this moment, air still lost by the fault place, the pressurized air of being carried also can be supplied loop still in working order (and secondary consumption loop).A shortcoming of existing multiloop protective valve is that the maximum pressure in the brake system equates with the pressure of opening of defective loop when breaking.Another shortcoming is that pressure drops to the shutoff pressure in defective loop at once.Especially Tu Chu shortcoming is owing to the detection to the defective loop is in the relative later stage with closing, so degradation of energy is relatively large when loop fault takes place.

Therefore the purpose of this invention is to provide the device of a kind of method and the above-mentioned type, thereby detect defective or the fault that pressurized air consumes the loop in the stage early.

About this method, can realize this goal by the present invention according to claim 1.The device that is used for implementing this method is set forth to some extent in claim 8.

Advantage of the present invention and favourable improvement have illustrated in the appended claims.

Can obtain bigger advantage according to the present invention is, can detect defective or the fault that pressurized air consumes the loop in the stage early, thereby the degradation of energy pressurized air can be consumed loop fault the time is controlled at minimum degree.Generally speaking, can improve the safety of vehicle greatly.

To on the basis of accompanying drawing, be described in more details below, a real example be shown in these accompanying drawings the present invention, wherein:

Fig. 1 shows the block scheme of the device of being invented (compressed air system);

Fig. 2 and 3 shows in more detail and to explain that detecting one consumes the defective in the loop or the chart of fault.

In the accompanying drawings, the effective solid line of pressure fluid represents that the electric wiring with dashed lines is represented.

As shown in the figure, one has pressurized air supply section 4 and the compressed air system 2 that consumes part 6.Pressurized air supply section 4 comprises a compressor 7, a compressor control device 8 and a dry air part 10.

Consume part 6 and be provided with pressurized air distribution pipe 14, a plurality of electrically operated

valve

16,18,20,22,24 (preferably being electromagnetic valve) and a plurality of

consumption loop

26,28,30,32,34,36,38 with recovery spring, these consume loops and obtain pressurized air through electromagnetic valve.

One pressurized air supply pipe 40 leads to distribution pipe 14 from compressor 7 by a filter 42, an air dryer 44 and a boiler check valve 46, and distribution pipe 14 has all

arms

48,50,52,54,56 that lead to all electromagnetic valves.

Compressed air tube

58,60,62,64,66 leads to the consumption loop from all electromagnetic valves.Pipe 62 is provided with branched pipe 62 ' and 62 ", they lead to

loop

30 and 32, at pipe 62 " in be equipped with boiler check valve 68.In supply pipe 52, be in series with a voltage limiter 70.The pipe 54 that leads to electromagnetic valve 22 forms branch in the downstream of voltage limiter 70.Pipe 64 has branched pipe 64 ' and 64 ", they lead to

loop

34 and 36.

Pressure in

pressure sensor

72,74,76,78,80,82 monitoring all consumption loops and the distribution pipe 14, and each pressure is passed to the electronic control unit 84 of all electromagnetic valves of control as pressure signal.

Consume

loop

26,28 and can be for example foot brake loop.Consume loop 30 and can be the trailer braking protection valve loop, in this case, two tubes usually: supply pipe and one are led to the trailer braking protection valve pipe.Consume loop 32 and can be the hand braking loop that has spring accumulator.Consume

loop

34 and 36 and can be secondary and consume the loop, such as operator's compartment suspension, door controller etc., in other words, i.e. all assemblies that have nothing to do with brake circuit.Consume loop 38 and can be a high tension loop.

Foot brake loop

26,28 is provided with the pressurized

air reservoir vessel

90,92 of conform European standard (EU Directive) 98/12.

Compressed air system of the present invention can be saved the pressurized air storage container in

loop

30,32,34,36, especially the Pneumatic Suspension loop 38.For example, as long as the braking function or the braking maneuver of

foot brake loop

26 and 28 are not weakened, can allow to consume the loop to other and carry out air feed by foot brake loop (loop 26 and 28).

By a pipe 40 ', compressor 7 is controlled by compressor controller 8 machineries (pneumatic).Compressor controller 8 comprises the less electromagnetic valve of a Nominal Width 94, and this electromagnetic valve can be switched by electronic control unit 84.As shown in the figure, under the normal condition of outage, lead to atmosphere, compressor 7 startups this moment.As want close compressor 7, for example when all being full of pressurized air in all consumption loops, just the position of control unit 84 switching solenoid valves 94 makes and can close by pipe 40 ' by pressure-actuated compressor.If electromagnetic valve 94 is switched to off-position, for example when a consumption loop needs pressurized air, once more electromagnetic valve 94 is switched to the normal condition shown in the figure, thus, pipe 40 ' is opened, and compressor 7 starts heavily again.

Dry air part 10 comprises that one has the electromagnetic valve 100 of less Nominal Width, the import 102 of this electromagnetic valve is communicated with distribution pipe 14, its outlet 104 links to each other with the shut off valve 106 of air operated control, and this shut off valve is communicated with the supply pipe 40 of compressor 7, is used as the exhausr port of air dryer.

When electromagnetic valve 100 was switched to connected state, compressor 7 was no longer to consuming the loop air feed, but by valve 106 to atmospheric exhaust.Meanwhile, dry air then by distribution pipe 14 (being connected) with the

storage container

90,92 in foot brake loop through electromagnetic valve 100, flow regulating valve 108 and boiler check valve 110 air dryer 44 of flowing through, make its desiccant regeneration, air passes through filter 42 and valve 106 exhaust to atmospheres more then.

Label 112 expressions one overpressure valve.

Electromagnetic valve

16,18,20,22,24 is by control unit 84 control, and the electromagnetic valve 16 to 22 that consumes loop 26 to 34 is under the normal condition of outage and opens, and the electromagnetic valve 24 of high tension loop is under the normal condition of outage and closes.Also can use all guiding control reversing solenoid valves.Pressure in the loop is directly monitored at the electromagnetic valve place by

pressure sensor

72,74,76,78,80.

During as the pressure decay that consumes in loop, for example loop 30 (the trailer braking protection valve loop) when one, pressurized air can be supplied in

foot brake loop

26 and 28, the pressure that voltage limiter 70 can consume secondary in the loop 30 to 36 is adjusted to than the lower level of the pressure in the foot brake loop (for example 10.5bar), for example 8.5bar (seeing following content).Pressure in the high tension loop 38 for example is 12.5bar usually above other consumption loop.

To on the basis of Fig. 2 and 3, explain in more detail method of the present invention.

As mentioned above, the pressure that consumes in the loop 26 to 38 can be measured by pressure sensor 72 to 80; Yet, on the position of these pressure sensors shown in Figure 1, such pressure sensor can not directly be measured the pressure in each consumption loop, but in the inflow point that leads to the pressure supply pipe 56 to 66 that consumes the loop, perhaps in other words, measure in the exit of each electromagnetic valve that is associated 16 to 24.

Therefore, only under the state that pressure equates, the consumption loop 26 to 38 that the pressure that is write down by pressure sensor 72 to 80 is just relevant with each equates; Otherwise, when because the pressurized air consumption in the loop and when carrying out repressurize by standpipe 48 to 66 and during additional windstream overvoltage solenoid, they are not wait.It is poor to produce dynamic pressure along standpipe, pressure in this dynamic pressure official post loop is lower than the pressure that records in the electromagnetic valve place, when (for example consuming the loop et out of order, because of pipeline breaking) time this difference of pressure seem maximum, in other words, because of breaking so, have barometric pressure at pressure supply pipe 58 to 64 near the part in loops, the pressure of the connection pipe 14 that records at the pressure sensor check point descends because of the pressure decay of solenoid tube.

Since when such breaking taken place, charge air very big (up to 5000 liters/minute), and pneumatic bonded assembly pressure chamber this means that also in exhaust for example the pressure in the connection pipe 14 is also in rapid decline.

Under the situation of this powerful exhaust, depend merely on force value that pressure sensor 72 to 80 self measures and be difficult to the failure-free integrality that reconstruction can definitely detect fault pressurized air loop.

According to the present invention, can by determine instantaneous when closing exhaust extraction flow the influence in loop detected defective pressurized air consume the loop.When pressure descends continuously in the loop of defectiveness, both detected in all other loops less than influence this moment the pressure rising had not taken place yet, this is because the result as not passing through the exhaust in defective loop can rise pressure by the air that charges in the pressurized air storage container once more.As schematically illustrated in Fig. 2.

Below making pressure decay (seeing the line A among Fig. 2) owing to defective or braking maneuver and dropping to pressure limit value such as a P, perhaps negative pressure gradient (pressure decay is than the time) drops in the following consumption loop of a limit, electromagnetic valve that they are opened usually or the valve that all are such are closed by electronic control unit 84 simultaneously, and the variation of the pressure after closing is followed the tracks of by control unit.Still continue to descend (shown in line B) if close downstream pressure, there is defective really in this expression, and for example because pipe splits or breakage, this is detected by the pressure signal of electronic control unit 84 according to pressure sensor.Then, control unit will consume the closed electromagnetic valve that the loop is associated with fault, and soon fault loop will be whole closes, thereby make loop in working order continue normal operation, not be subjected to the influence of fault loop.

As not having in the intact loop of pressurized air storage container one, pressure in the pent loop is being closed instantaneous point P (line C) not change afterwards, perhaps in an intact loop with pressurized air storage container, pressure even rise to than on the higher point in instantaneous point P place (line D), though still fluctuation of pressure E can take place at the beginning the time, this represents that still this is an intact loop.In the case, control unit 84 is not measured.

It also may be to change caused by other dynamic pressure surge overvoltage or dynamic pressure in fluctuation of the dynamic pressure in the AIRMATIC Dual Control or the consumption loop that pressure is lower than limit, even in fact there is not fault, control unit 84 also can be interpreted as failure condition with this situation.In order to guarantee in this case not to be closed by the consumption loop that mistake is defined as fault loop, according to a favourable improvement of the present invention, being that mode with the pulse of saying so applies instantaneous closing for several times continuously, is an of short duration observing time after each instantaneous closing, such as 0.4 second.Only just can be when having carried out that pressure still descends after for several times pulsed is closed with cooresponding consumption loop final plant closure.After this will proceed monitoring to the consumption loop of final plant closure, and whether not have fault really or no longer include fault to determine it.

Explain detection now in detail to the fault in the brake circuit 26 on the basis of Fig. 3.

As shown in Figure 3, at instantaneous point 120 places, brake circuit 26 is because of the piping failure et out of order, and pressure sensor 72 measured force value descend rapidly; As a result, as previously mentioned, in the brake circuit 28 (seeing the curve 74 among Fig. 3) and the also sharply decline of the pressure (not having shown in Figure 3) in the connection pipe 14 of pneumatic communication.The caused result of pressure decay in the connection pipe 14 makes the electromagnetic valve 94 of opening compressor start at instantaneous point 121 places.Now having detected the pressure decay in the loop 26, will for example be the control inlet that 0.2 second test pulse sends electromagnetic valve 16 at instantaneous point 122 places, and between this time in the section with closed electromagnetic valve; Because pressure reduces to such an extent that suspect at first than bigger in the loop 28 that at electromagnetic valve 16 places piping failure is arranged, and therefore determines electromagnetic valve 16.

This result who closes is the instantaneous rising of pressure at pressure sensor 74 places in the unaffected brake circuit 28, and after fault loop 26 had hindered exhaust, pressurized air storage container 92 can provide air to loop 28 in working order once more.Yet for fault loop 26, owing to hindered by the repressurize in intact loop, pressure sensor 72 place's pressure decays are faster in the process of valve closing.In the process of test pulse, the pressure at

pressure sensor

76,78 places in

loop

30,36 does not change; In whole bleeding process, can break away from connection with distribution pipe 14 because of voltage limiter 70 guarantees all pressure sensors, so the pressure in these loops does not change substantially all under any circumstance.It is very fast to have only loop 26 pressure decay in the test pulse duration of existence to get, and has strengthened the suspection to this loop et out of order thus.In order to determine whether this conclusion is correct, mode that can pulse is closed valve 16 and is come this test of repetition for several times; In real example, having carried out at instantaneous point 123 places also is for the second time last such test.Pressure in the loop 26 descends once more fast, determines that finally loop 26 is fault loops, after this it is forever closed.

In order to supply air once more to brake circuit 26 in working order, electromagnetic valve 24 at instantaneous point 124 places with high tension loop 38 switches to open mode, so that to loop 28 in working order and, if necessary, also be loop 30 in working order and 36 fast aeration to pneumatic communication.Carry out in desirable mode in order to ensure inflation, high tension loop 38 is provided with a pressurized air storage container (not shown).In this fast aeration process, the pressure decay in the high tension loop can be examined at pressure sensor 80 places, shown in the decline at instantaneous point 124 places.After finishing inflation again, begin a period of time is closed in loop 28 from instantaneous point 125.In this time, high tension loop is inflated again by operating compressor.Inflate back (not shown in Figure 3) again and again having finished this, reset the control signal of

electromagnetic valve

94 and 18.

Except pressure being descended fast, suspects that the electromagnetic valve in loop in bad order carries out tentative the closing with said method, can also be with several or all closed electromagnetic valves; So just can obtain similar pressure and change, particularly each such close can both stop by connection pipe 14 carry out repressurize to fault loop.

Except pressure, also might monitor other state variable, consume charge air, air quality and the energy in loop such as pressurized air.

Claims

1. one kind is detected pressurized air in the vehicle compressed air system and consumes the defective in the loop or the method for fault, wherein carries out continuous monitoring and assessment to leading to all ducted pressure that pressurized air consumes the loop, it is characterized in that having following steps:

The loop is instantaneous closes with the consumption of at least one pressurized air;

In the process that at least one pressurized air consumption loop is closed, measure the value of state variable (pressure, charge air, air quality, energy) and/or the gradient of definite state variable;

With these values and/or gradient and the comparison of a limit separately;

After dwell period and/or dwell period,, determine that a pressurized air consumes the loop and is defectiveness or fault is arranged when the gradient of the value of state variable and/or state variable drops to limit when following.

2. the method for claim 1 is characterized in that, will be defined as defectiveness or consumption of air in bad order loop finally or is forever closed.

3. the method for claim 1 is characterized in that, carries out instantaneous closing (pulsed is closed) continuously for several times.

4. method as claimed in claim 3, it is characterized in that, at of short duration dwell period, variation measured value and/or determined gradient to state variable is followed the tracks of, and, even the value or the gradient of state variable still finally or are forever closed in each all pressurized air consumption loop below limit after of short duration the closing of predetermined quantity.

5. as a described method in the above claim, it is characterized in that, consume after the loop finally or forever closes the fault pressurized air being consumed loop or all fault pressurized airs, all pressurized airs in working order loop is inflated again.

6. as claim 2,3 or 4 described methods, it is characterized in that, after all fault pressurized airs are consumed the loop final plant closure, cancel that once more all pressurized airs in working order are consumed closing of loop.

7. as claim 1,3 or 4 described methods, it is characterized in that limit is corresponding with the state variable that will regulate in each pressurized air consumption loop.

8. one kind is detected pressurized air in the compressed air system and consumes the defective in the loop or the device of fault, this compressed air system has a pressurized air supply section and that is provided with a compressor and is provided with the consumption part that a plurality of pressurized airs consume the loop, these pressurized airs consume the loop and obtain compressed-air actuated supply by all motorized valves, pressure in wherein all pressurized air consumption loop is by all sensor monitors, the electric signal of these sensors is by the electronic control unit assessment of all motorized valves of a control, it is characterized in that, pressurized air consumes loop (26,28,30,32,34,36) motorized valve (16,18,20,22) at least one in can be by the instantaneous closed condition that switches to of control unit (84), to detect defective or the fault in the pressurized air consumption loop, wherein control unit is with state variable (pressure, charge air, air quality, energy) the measured value and/or the gradient of determined state variable and a limit compare, and the value and/or the pressurized air loop of gradient below limit of state variable is defined as defectiveness or fault pressurized air consumption loop.

9. device as claimed in claim 8, it is characterized in that, control unit (84) will place closed condition with the electrically operated electromagnetic valve that the pressurized air consumption loop that is confirmed as defectiveness or fault interrelates, and the electrically operated electromagnetic valve in other pressurized air consumption loop is switched to the normal position of opening again.

10. device as claimed in claim 8 is characterized in that, control unit (84) switches to off position for several times continuously momently with at least one motorized valve (16,18,20,22) that pressurized air consumes loop (26,28,30,32,34,36).

11. device as claimed in claim 10, it is characterized in that, control unit (84) is determined the value and/or the gradient of state variable in the process of dwell period, and value or gradient with state variable after finishing the dwell period of predetermined quantity consume the loop that the loop is defined as defectiveness or fault in each all pressurized air below limit, and they finally or are forever closed.

12. device as claimed in claim 11 is characterized in that, control unit (84) switches to all motorized valves that all pressurized airs in working order consume the loop under the outage normal condition of opening once more.

13. as claim 11 or 12 described devices, it is characterized in that, after all motorized valves are switched to the normal condition of opening, all pressurized airs in working order loop inflated again.

14., it is characterized in that limit is corresponding with the state variable that will regulate as claim 8 or 10 described devices in each pressurized air consumption loop.

15. a described device as in the claim 8 to 14 is characterized in that all motorized valves are electromagnetic valve.